The hierarchy of controls for noise can be summarized as: 1) eliminate or minimize noise exposure by installing equipment that produces less noise (e.g., buy-quiet programs), 2) prevent or contain the escape of noise at its source (engineering controls), 3) control exposure by changing work schedules to reduce the amount of time any one worker spends in the high noise area (administrative controls) or by changing practices such as distancing from noise-producing equipment (work practice controls), and 4) control the exposure with hearing protection. This hierarchy highlights the principle that the best prevention strategy is to eliminate exposure to hazards that can lead to hearing loss. Corporations that have started buy-quiet programs are moving toward workplaces where no harmful noise will exist. Many companies are automating equipment or setting up procedures that can be managed by workers from a quiet control room free from harmful noise. When it is not possible to eliminate the noise hazard or relocate the worker to a safe area, the worker must be protected with PPE.
A number of references on engineering controls are listed in Section VII-Resources. Some have been in use many years; however, many of the principles of noise control are as relevant now as they were decades ago. Additionally, considerable information is available in:
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